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. Retrogressive thaw slumps (RTSs) are among the most activethermokarst landforms in the Arctic and deliver a large amount of materialto the Arctic Ocean. However, their contribution to the organic carbon (OC)budget is unknown. We provide the first estimate of the contribution of RTSsto the nearshore OC budget of the Yukon Coast, Canada, and describe theevolution of coastal RTSs between 1952 and 2011 in this area. We (1) describethe evolution of RTSs between 1952 and 2011; (2) calculate the volume oferoded material and stocks of OC mobilized through slumping, including soilorganic carbon (SOC) and dissolved organic carbon (DOC); and (3) estimate the OCfluxes mobilized through slumping between 1972 and 2011. We identified RTSsusing high-resolution satellite imagery from 2011 and geocoded aerialphotographs from 1952 and 1972. To estimate the volume of eroded material,we applied spline interpolation on an airborne lidar dataset acquired inJuly 2013. We inferred the stocks of mobilized SOC and DOC from existingrelated literature. Our results show a 73 % increase in the number of RTSsand 14 % areal expansion between 1952 and 2011. In the study area, RTSsdisplaced at least 16.6×106  m 3 of material, 53 % of which wasice, and mobilized 145.9×106  kg of OC. Between 1972 and 2011, 49 RTSsdisplaced 8.6×103  m 3  yr −1 of material, adding 0.6 % to the OC fluxreleased by coastal retreat along the Yukon Coast. Our results show that thecontribution of RTSs to the nearshore OC budget is non-negligible and shouldbe included when estimating the quantity of OC released from the Arcticcoast to the ocean.

Increasing coastal slump activity impacts the release of sediment and organic carbon into the Arctic Ocean